I am having some issues with my SDcard and noticed that the LOST.DIR directory has 111 files in it and keeps growing. I am sure I can delete all the files in there and be safe but I would really like to know what the purpose of this folder is and how these files end up here??? My ultimate problem is writing to the SDcard. I get errors all over the place with anything that has to write to the SD. Example... pictures are not saved when using camera, file manager says the card is full (nowhere close 10g free), Dolphin browser can't save a downloaded file due to no memory, market cannot update an app that is installed on the SD due to "missing USB mass storage". All of these are not consistent nor do they happen all the time. Phone will be good for about 3 days after a reboot or an hour or not at all. This is my second SDcard and is a 16g Class 10. Class 10 maybe too high for the X?